Inline layers after migrating from R77.30

I developed all our Application Control, URL Filtering and IPS policies in R77.30 in mid 2017. Then in December 2017, I upgraded our entire environment to R80.10. Now, converting the AP/URL rulebase to inline layers is a bit more tedious with all in production. That couples with recommendations that we NOT use 'Internet' object and instead use negated private networks for destinations, this can get a little dicey.

Can you think of a strategy to move all the rules to in-line with minimal risk of any outage?